[@Jig] Thanks for the report.

Edit: Before you try to answer the questions below, can you first try to create your Advanced topic but instead put some placeholder text like "Testing..." in your first post? (You can always edit the post once the topic is created). Basically, there's a bug where the forum silently fails if you trigger a validation error (like "too many tags" or "title too long") and if your post is past a certain length. By putting a little bit of filler text into the post when creating a topic, the forum will show you what you need to fix instead of silently failing. It's a known bug that I need to fix, so let's first try to rule out this case.

- What page are you getting the "automatic cache" message on?
- What actually happens when you try to create a thread in Advanced? Do you see "INTERNAL ERROR" or something else? Is it when you go to the "New Topic" page or when you actually submit the form to the server?
- Do these things happen every single time or does it sometimes work and sometimes break?

Need some help narrowing down the issues to the right pages for me to take a closer look at. So far I'm unable to reproduce the issue. It's definitely an issue with the guild, it just apparently doesn't affect everyone.